Well this is a bit strange. Does anyone know when this started? The way the ISO is put together hasn't changed since the hirsute release, so this is probably related to a change in grub2 or shim. The bug was reported less than 24 hours after a new version of grub2 landed which is definitely something that makes one go "hmm". I'll reassign the package there -- this certainly isn't a syslinux problem as that hasn't been used at all to boot ISOs since focal, and afaik never ever when booting via UEFI.
Well this is a bit strange. Does anyone know when this started? The way the ISO is put together hasn't changed since the hirsute release, so this is probably related to a change in grub2 or shim. The bug was reported less than 24 hours after a new version of grub2 landed which is definitely something that makes one go "hmm". I'll reassign the package there -- this certainly isn't a syslinux problem as that hasn't been used at all to boot ISOs since focal, and afaik never ever when booting via UEFI.